Temp file not being added into the zip and the downloaded zip is not an actual "archive"

[ED-Y-S]

static_zip = Tempfile.new('a.zip')
Zip::File.open(static_zip, Zip::File::CREATE) do |z|

    files.all do |file|
	    
	    temp_file = Tempfile.new(filename)
	    file.download(temp_file.path)
    
	    z.add(filename, temp_file.path)
    
    end 
 end

I've skipped something in between but all the essential parts are in there. After using download() to get the file from Google Cloud, the file was never added into the TempFile that is my zip.

Even when the program spews out a zip file, it can't be opened by any unzip apps (eg., 7zip states that it's not an archive) and it has weird numbers/character after .zip extension when I check the process on the terminal

What am I missing here?